Combining Texts

You have chosen 'Through the Looking Glass' by Lewis Carroll (C.Dodgson), 'The Tragic Sense of Life' by Miguel de Unamuno and 'The iterative conception of Set' by George Boolos

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All the ideas for Objects, or select a subheading:
      A. Existence of Objects
      B. Unity of Objects
      C. Structure of Objects
      D. Essence of Objects
      E. Objects over Time
      F. Identity among Objects